如何知道HTML标签字符串的渲染长度

我正在使用html标签来显示按钮上的参数及其值。一些按钮包含一个参数，一些按钮有2或3个参数。 “”/“”用于分隔值。名称和值之间有一条空行。但是在长值的情况下，我想使用该空行来显示“表H/V”按钮的值。如何知道HTML标签字符串的渲染长度

我想使用值字符串的长度来确定是否需要空行。它不能正常工作，因为字符号不反映该字符串的绘图长度。按钮大小是固定的。

我在问我怎么能知道什么时候应该有一个“< br>”代表那个空行？或我怎么知道值字符串何时会被换行到另一行？

这是我的代码：

private static String getBtnDisplayStr(String name, String value) 
    { 
     StringBuilder sBuilder = new StringBuilder(); 
     sBuilder.append("<html><center><b>"); 
     sBuilder.append(name); 
     if(value.length() <= 12) //add one empty line for short value string 
     { 
      sBuilder.append("</center></b><br><br><font size=\"2\">"); 
     } 
     else 
     { 
      sBuilder.append("</center></b><br><font size=\"2\">"); 
     } 
     sBuilder.append(value); 
     sBuilder.append("</font></html>"); 

     return sBuilder.toString(); 
    }

这里的按钮： enter image description here

来源

2012-12-20 5YrsLaterDBA

的SwingUtilities＃的layoutCompoundLabel – mKorbel

设置按钮上的文本，然后检查按钮的“首选宽度”。如果太大，请相应地调整文字。

这里是从上面有两个你的按钮的例子：

private static int BUTTON_WIDTH = 90; // Adjust this as necessary 

public static void main(String[] args) { 
    JFrame frame = new JFrame(); 
    JPanel pnl = new JPanel(); 

    JButton btn1 = new JButton(getBtnDisplayStr("Table H/V",null,"909.0/500.0")); 
    if (btn1.getPreferredSize().width > BUTTON_WIDTH) { 
     btn1.setText(getBtnDisplayStr("Table H/V", "909.0 /", "500.0")); 
    } 
    JButton btn2 = new JButton(getBtnDisplayStr("Acq/ISD",null,"1/1")); 
    if (btn2.getPreferredSize().width > BUTTON_WIDTH) { 
     btn2.setText(getBtnDisplayStr("Acq/ISD","1 /","1")); 
    } 

    pnl.add(btn1,BorderLayout.LINE_START); 
    pnl.add(btn2,BorderLayout.LINE_END); 

    frame.add(pnl); 
    frame.pack(); 

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setVisible(true); 
} 

private static String getBtnDisplayStr(String name, String valueLine1, String valueLine2) { 
    StringBuilder sBuilder = new StringBuilder(); 
    sBuilder.append("<html><center><b>"); 
    sBuilder.append(name); 
    sBuilder.append("</b><br/>"); 
    if (valueLine1 != null) { 
     sBuilder.append("<font size=\"2\">"); 
     sBuilder.append(valueLine1); 
     sBuilder.append("</font>"); 
    } 
    sBuilder.append("<br/>"); 
    if (valueLine2 != null) { 
     sBuilder.append("<font size=\"2\">"); 
     sBuilder.append(valueLine2); 
     sBuilder.append("</font>"); 
    } 
    sBuilder.append("<br/>"); 

    sBuilder.append("</center></html>"); 

    return sBuilder.toString(); 
}

来源

2012-12-20 20:03:36

默认情况下有没有理由计算PreferredSize为Html <=3.2和Swing JComponents
留到LayoutManager，例如GridLayout从最大元素计算屏幕尺寸

enter image description here

import java.awt.GridLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.SwingUtilities; 

public class HtmlAndJButton { 

    final String buttonText = " Whatever words, <br> but nothing wise"; 
    final String buttonText1 = " Whatever words, <br> but nothing wise, " 
      + "<br> plus 1st. line, "; 
    final String buttonText2 = " Whatever words, <br> but nothing wise, " 
      + "<br> plus 1st. line, <br> plus 2nd. line,"; 
    private JButton btn1 = new JButton("Toggle"); 
    private JButton button = new JButton(buttonText); 
    private JButton button1 = new JButton("Toggle"); 
    private JButton button2 = new JButton("Toggle"); 

    public HtmlAndJButton() { 
     btn1.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       button.setText("<html><font color=" + (button.isEnabled() 
         ? "blue" : "red") + ">" + buttonText + "</font></html>"); 
       button.setEnabled(!button.isEnabled()); 
       button1.setText("<html><font color=" + (button1.isEnabled() 
         ? "red" : "green") + ">" + buttonText1 + "</font></html>"); 
       button1.setEnabled(!button1.isEnabled()); 
       button2.setText("<html><font color=" + (button2.isEnabled() 
         ? "green" : "yellow") + ">" + buttonText2 + "</font></html>"); 
       button2.setEnabled(!button2.isEnabled()); 
      } 
     }); 
     button.setText("<html><font color=red>" + buttonText + "</font></html>"); 
     button1.setText("<html><font color=green>" + buttonText1 + "</font></html>"); 
     button2.setText("<html><font color=yellow>" + buttonText2 + "</font></html>"); 
     JFrame f = new JFrame("ButtonTest"); 
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     f.setLayout(new GridLayout(2, 2)); 
     f.add(button); 
     f.add(button1); 
     f.add(button2); 
     f.add(btn1); 
     f.pack(); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       HtmlAndJButton t = new HtmlAndJButton(); 
      } 
     }); 
    } 
}

来源

2012-12-20 20:29:21 mKorbel

如何知道HTML标签字符串的渲染长度

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